[PENHALLOwW] NORTH AMERICAN SPECIES OF DADOXYLON Le 
curved; the lateral walls showing no structure which has been 
obliterated by decay; the cells 3-5 tracheids long. 
Tangential—Rays numerous, medium, 1-3 seriate; the cells round, thin- 
walled, 47 mic. broad. 
CUPRESSINOXYLON COMANCHENSE, n. Sp. 
Collected by Prof. Prosser from the Comanche Cretaceous (?) N.W. 
of Ashland, Clark Co., Kansas, 1897. The material is badly preserved 
and some of the details cannot be made out satisfactorily, especially if 
the pits are 1 or 2 seriate. It bears a very striking resemblance to 
some of the Cupressineæ. 
Transverse.—Tracheids in regular, radial rows, rounded, very uniform, 44 x 44 
broad, the walls 12.5 mic. thick. Resin passages and special resin cells. 
Growth rings prominent, about 10 in a radial extent of 22 mm.; 
the summer wood thin, composed of 2-4 rows of tracheids, the latter 
about 22 mic. wide, the walls 12.5 mic. thick. 
Resin passages and resin cells wholly wanting. 
Worm borrows are frequent and show copious exudation of 
resin which has often preserved the adjacent structure from decay. 
Radial.—Ray cells of one kind only, straight; the upper and lower walls thin 
and not pitted; the terminal walls thin, not pitted, chiefly curved; 
the lateral walls with oval, bordered pits about 1-2 per tracheid, the 
oblong or broadly lenticular orifice nearly as long as the pit; the 
cells equal to about 4 tracheids. 
Bordered pits round, large, 19 mic. broad; in one or sometimes 
2 rows, the orifice round. 
Tangential.—Rays uniseriate, the cells thin-walled, round, 19 mic. broad. 
ARAUCARIOXYLON PROSSERI, n. Sp. 
' 
One of the Prosser collection from the Cheyenne (Comanche 
Cretaceous), of the Bluff west of Sun City, Medicine Lodge River, 
Baker Co., Kansas, 1897. 
Transverse.—Tracheids in regular radial rows, squarish, 39 x 42 mic. broad; 
the walls 6.2 mic. thick. 
Resin cells and special resin passages wholly wanting. No 
evidence of growth rings in a radial extent of 22 mm. 
Radial.—Ray cells all of one kind, straight or narrower at the ends, equal to 
3-9 tracheids ; the upper and lower walls thin, and devoid of pits ; 
the terminal walls thin, not pitted, curved; the lateral walls show 
no structure through extreme alteration. 
Bordered pits not clearly determinable, but probably round and 
in one row. 
Tangential—Rays numerous, chiefly low; the cells broad, round, about 31 
mic. wide. 
